Alert archive / Illinois / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 144
The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2014, 3:05 PM CDT for 29 counties in Illinois; 16 counties in Wisconsin. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2014, 3:05 PM CDT (20:05 UTC)
- Expired
- May 11, 2014, 10:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 45 counties
Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 104 km from the middle of the area, began a volume at 20:08 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 3:19 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 56 min |
| May 11, 3:35 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green | 40 min |
| May 11, 3:43 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Rock Island, Whiteside | 62 min |
| May 11, 3:48 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 57 min |
| May 11, 4:02 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 58 min |
| May 11, 4:23 PM CDT | Severe Thunderstorm Warning | MKX | Green, Rock | 37 min |
| May 11, 4:27 PM CDT | Severe Thunderstorm Warning | ILX | Knox | 63 min |
| May 11, 4:32 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 58 min |
| May 11, 4:36 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane | 54 min |
| May 11, 4:50 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 55 min |
| May 11, 5:01 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 59 min |
| May 11, 5:15 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Woodford | 45 min |
| May 11, 5:15 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 45 min |
| May 11, 5:26 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Grundy, Iroquois, Kankakee, Kendall, Livingston and 1 more | 64 min |
| May 11, 5:34 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 56 min |
| May 11, 5:44 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, LaSalle, Livingston | 61 min |
| May 11, 5:50 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 55 min |
| May 11, 6:10 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Kendall, Will | 35 min |
| May 11, 6:32 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 58 min |
| May 11, 6:34 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Woodford | 41 min |
| May 11, 6:57 PM CDT | Flash Flood Warning | LOT | Cook, Ford, Grundy, Iroquois, Kankakee, Kendall and 2 more | 4 hr |
| May 11, 7:43 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 62 min |
| May 11, 7:58 PM CDT | Flash Flood Warning | LOT | Ford, Livingston | 3 hr |
| May 11, 8:12 PM CDT | Flash Flood Warning | ILX | McLean, Woodford | 3 hr |
| May 11, 9:15 PM CDT | Flash Flood Warning | LOT | Ford, Iroquois | 6 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.1 hours before the alert went out and 116 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 52 J/kg
- Mixed-layer CIN
- -261 J/kg
- Mixed-layer LCL
- 1382 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:55 PM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 2 more | 95 min |
| May 10, 10:22 PM CDT | Mesoscale Discussion | SPC | Calhoun, Jersey, Madison, Monroe, Randolph, Saint Clair | 83 min |
| May 11, 9:16 AM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 89 min |
| May 11, 10:47 AM CDT | Mesoscale Discussion | SPC | Hancock | 118 min |
| May 11, 11:53 AM CDT | Tornado Watch | SPC | Carroll, Henderson, Henry, Mercer, Rock Island, Warren and 1 more | 7 hr |
| May 11, 12:51 PM CDT | Mesoscale Discussion | SPC | Carroll, Henderson, Jo Daviess, Mercer, Rock Island, Whiteside | 54 min |
| May 11, 2:36 PM CDT | Mesoscale Discussion | SPC | Mercer | 84 min |
| May 11, 5:09 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more | 66 min |
| May 11, 5:49 PM CDT | Mesoscale Discussion | SPC | Clark, Coles, Edgar | 56 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2014Severe Thunderstorm Watches in Wisconsin, 2014Every severe thunderstorm watch in 2014
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.